Include quic_str_cat.h in all the places it's used.

net/quic/core/quic_connection_test.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/core/quic_connection.h"
 
 #include <errno.h>
 #include <memory>
 #include <ostream>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/macros.h"
 #include "base/stl_util.h"
 #include "base/strings/stringprintf.h"
 #include "net/base/net_errors.h"
 #include "net/quic/core/congestion_control/loss_detection_interface.h"
 #include "net/quic/core/congestion_control/send_algorithm_interface.h"
 #include "net/quic/core/crypto/null_encrypter.h"
 #include "net/quic/core/crypto/quic_decrypter.h"
 #include "net/quic/core/crypto/quic_encrypter.h"
 #include "net/quic/core/quic_flags.h"
 #include "net/quic/core/quic_packets.h"
 #include "net/quic/core/quic_simple_buffer_allocator.h"
 #include "net/quic/core/quic_utils.h"
+#include "net/quic/platform/api/quic_reference_counted.h"
 #include "net/quic/platform/api/quic_str_cat.h"
 #include "net/quic/test_tools/mock_clock.h"
 #include "net/quic/test_tools/mock_random.h"
 #include "net/quic/test_tools/quic_config_peer.h"
 #include "net/quic/test_tools/quic_connection_peer.h"
 #include "net/quic/test_tools/quic_framer_peer.h"
 #include "net/quic/test_tools/quic_packet_creator_peer.h"
 #include "net/quic/test_tools/quic_packet_generator_peer.h"
 #include "net/quic/test_tools/quic_sent_packet_manager_peer.h"
 #include "net/quic/test_tools/quic_test_utils.h"
@@ skipping 5084 matching lines @@
                             error_details, ConnectionCloseSource::FROM_PEER));
   connection_.set_perspective(Perspective::IS_CLIENT);
   connection_.CloseConnection(QUIC_CRYPTO_HANDSHAKE_STATELESS_REJECT,
                               error_details,
                               ConnectionCloseBehavior::SILENT_CLOSE);
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace net